US3274374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical heating elements
Assignee: GTE Sylvania Inc
•
Filing: 1963-05-07
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Granted: 1966-09-20
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Expires: 1983-05-07
Abstract
No abstract record available.
Inventors
- 👤 Wilfrid G Matheson
- 👤 James P Clune
- 👤 Theodore J Pricenski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:54
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/22; H05B3/24; H05B6/00; H05B6/02; H05B6/36
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
45 words
IN A HIGH TEMPERATURE ELECTRIC DISCHARGE FURNACE HAVING A HOLLOW CATHODE DISPOSED THEREIN, THE IMPROVEMENT WHICH COMPRISES: AN ANODE DISPOSED INSIDE SAID CATHODE AND SPACED THEREFROM, SAID ANODE BEING A GENERALLY CYLINDRICAL PLEXUS FORMED OF A MULTIPLICITY OF INTERTWISTED HELICAL CONVOLUTIONS OF REFRACTORY METAL WIRES.
References Cited (Backward Citations)
US69193A
Cited
US223262A
Cited
US2686212A
Cited
US2908739A
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US2848523A
Cited
US3020387A
Cited
US3172002A
Cited
US3056881A
Cited
US3178665A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |